Can you swim at Nantasket Beach in September? — 18.0°C water
Yes, but expect a fresh dip
Average sea · September
18.0°C
Live water now
…
Recommended wetsuit
3/2mm fullsuit
mild
It depends. Nantasket Beach sits around 18.0°C in September; confident swimmers will be fine, casual bathers may prefer short sessions.
Monthly averages set expectations, but the specific beach today depends on wind, swell and recent weather. Check the live value at the top of this page or open the Nantasket Beach live page for full conditions.
Frequently asked questions
What is the average sea temperature at Nantasket Beach in September?
Nantasket Beach averages 18.0°C in September, based on long-run climatology for the Atlantic Ocean.
Is the sea warm enough to swim at Nantasket Beach in September?
It is swimmable but fresh; confident swimmers will be fine without a wetsuit.
Do I need a wetsuit at Nantasket Beach in September?
A 2 mm shorty is comfortable for sessions over 30 minutes.
